No, proof marks are usually specific to the proof house, in your case, the one in Liege, which is the only one in Belgium and handled all proofing for the country. Since the firearms manufacture was centered around that city that wasn't much of an issue.
If you're interested into the subject, look for Wirnsberger's "standard directory of proof marks", I pulled mine of ebay for $10.
I used to love being able to hit hard at 1000 yards. As I get older I find hitting a mini ram at 200 yards with the 22 oddly more satisfying.